if we have date f.e. '2006.10.30' we can easily check it with 
/\d+\.\d+\.\d+/

[download]
or 
/^(([1-9]|1[1,2]]).([1-9]|1[0-9]|2[0-9]|3[0,1]))$/

[download]
etc.. but those are minimal checks, some months have 28..31, and every 4 years 02.28 becomes 02.29

so my question is "is there any ultimate date check regexp, how would it look like" (i didn't manage to find one)

thanks for your time.

In reply to ultimate date check regexp by Anonymous Monk

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